Pulmonary gas exchange occurs in the:
a) larynx.
b) conducting zone.
c) respiratory zone.
d) upper respiratory tract.
Answer: c) respiratory zone.
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An enzyme that digests proteins into peptides is
A) lipase. B) amylase. C) nuclease. D) maltase. E) trypsin.
Answer the following statements true (T) or false (F)
1. In general, as blood viscosity drops, blood pressure increases. 2. Contracting skeletal muscles and breathing help the veins return blood to the heart. 3. The apex of the heart lies on the diaphragm muscle. 4. The muscle tissue of the heart is called myocardium. 5. The visceral pericardium is also called the endocardium.
There is a smooth muscle layer in the walls of all blood vessels except
1.veins. 2.capillaries. 3.arterioles. 4.arteries. 5.None of these is correct; all vessels have a smooth muscle layer.
The indicated blood vessels and nerve are found within a ______.
See A&P photo Central (Haversian) canal Perforating (Volkmann's) canal marrow cavity caniculus